* {
    box-sizing: border-box;
}
body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}
canvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: antiquewhite;
    visibility: hidden;
}
#loading {
    position: relative;
    z-index: 10;
    height: 100%;
    width: 100%;
}
.postcard {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
}